Sound-transmitting device.



C. W. McGONlGLE.

SOUND TRANSMITTING DEVICE.

APPLICATION FILED 0CT.4. 1913.

1 1 99 1 96. Patented Sept. 26, -1916.

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CHARLES w. Me'eonrG E oE sEArrr'LE, wnsrr rlvero v, ns sienon To Unry EsnL HIGH POWER TELEPHONE German or KING COUNTY, WASHINGTON.

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Specification of Letters I Patent.

Patented Sept. 26, 1916.

Application iuel October 4,1913. seen Eb. 795,462.

ToaZZ whom it may concern a 7 Be it known that IQCHARL'Es W. MoGoNr- GLE, a citizen of the United States, andfa resident of Seattle, county of King, State of Washington, have invented certain and useful Improvements in Sound- Transmitting Devices, of which the following is "a specification.

This invention relates to sound transmitting devices and has for its principal object to provide novel andpeculiar means to render more effective the operation of a diaphragm or its equivalent in the process of reproducing or transmitting sound, than has heretofore been known to the art so'far as type, but any other suitable form such as a sprlng motor or the like may be used, as convenience may suggest; it being understood that I do not confine myself to any particular form of motor.

3 indicates a support which is rigid with the container 1, and revolubly mounted upon which is a drum 4, around the spindle 5 of which passes a driving belt 6 which is adapted to be operatively connected to the motor 2.

Rigid with the container 1 is the support 7, to the upper end of which is aflixed a mouthpiece 8 to the center of whose diaphragm 9 is secured one end of a flexible member 10, such as a stout fish twine, piano wire or the like, which extends toward the right, as viewed in Fig.1, and is passed around the drum 4 and continues on and has its opposite end secured to a lever 13 which is pivoted at 141 to the frame 15 of the diaphragm 11. The extreme right hand vend of said lever, as viewed in Fig. 2, is secured to the center of the diaphragm 11 and it will be noted that the cord 10 is secured to the said lever considerably nearer to the pivot 14am to the point where the said 1 37.3 is seci1re cl to the said diaphragm, so that a pull on the cord will cause amultiplied movement of the endofthe lever which is attachedto the diaphragm. The frame 15 of the diaphragm 11 is secured to the upper e ndof a support 16,,from which extends a horn 1 7, which may 'be of the construction of an ordinary megaphone. The interior of the "said horn communicates with the space within the frame 15 which is behind the diaila a mlltse. tha lera i-Qns f the ter are communicated to the interior of the horn. The lower end of the support 16 is pivoted, at 18, to the container 1 and the horn 17 is yieldingly held in the position shown by means of the spring 19 one end of which bears against the said horn and its opposite end against the screw 21 which passes through the bracket 20, rigid with the container 1, and by means of which the tension of the said spring may be varied to suit conditions, as will be understood.

The diaphragm 11 is normally under tension, that is to say, it bellies out in the direction of the diaphragm 9, the friction between the drum 4E and the flexible member 10 constantly acting to hold the diaphragm 11 in that position as the said drum is turned in an anti-clockwise direction as viewed in Fig. 1. The diaphragm 9 is normally at rest as the rotation of said drum constantly tends to produce slack in that portion of the cord 10 which is between the diaphragm 9 and the said drum. When sound waves are set up within the mouthpiece 8 the diaphragm 9 swells in the direction of the other diaphragm and causes friction between the drum 1 1 and that portion of the cord which is passed around the drum, to decrease, which permits the lever 13 to move about its pivot and in the direction of the horn 17 under the influence of the tension of the diaphragm 11 and the inertia of the lever 13 vibration being much greater than that of the diaphragm 9, which results in an amplification of the sound through the horn 17. The vibration of the diaphragm 11 is, of course, so rapid that the inertia of the horn is not overcome and the same remains held in its position as seen in Fig. 1. After the diaphragm 11 has movfld to its extreme position toward the right, as just described, it is immediately drawn in the opposite direction a much greater distance than it would be as the result of the inherent spring of the diaphragm itself, due to the lever 13 and the cord 10 between which and the drum let the friction is now suflicient to hold the cord 10 to the drum while the latter rotates, and the diaphragm 9 of course meanwhile is returning to normal and taking up the slack in the cord 10 which is between the said diaphragm and the drum. The action is therefore 01 a winch-like nature, the diaphragm 9 serving to take up the slack while the winch action of the drum eL draws upon the cord 10.

I have shown a particular form of embodiment of my invention but I am aware that many structural changes therein will readily suggest themselves to others without departing from the spirit and scope of my invention, and I do not desire to be limited to the exact form described.

What I claim is:

In a sound amplifying device, a box shaped container, a rigid horn support at one end and a pivoted horn support at the opposite end of said container, horns each having a diaphragm suitably secured upon said supports, a rigid drum support intermediate said horn supports, a drum revolubly mounted on said support, means for revolving said drum, a lever pivotedly mounted upon the pivotally mounted horn and connected to the center of the diaphragm of the said horn, and a flexible member having one end connected to the diaphragm of the horn secured 011 the rigid support and extending around the revoluble drum and having its opposite end connected to said lever, as and for the purpose set forth.

CHARLES WV. MGGONIGLE. l/Vitnesses:

F. P. GORIN, R. D. SMALLEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

